<template>
  <canvas v-if="canvasId"
          class="ec-canvas"
          :id="canvasId"
          :canvasId="canvasId"></canvas>
  <!-- @error="error" -->
  <!-- @touchstart="touchStart" @touchmove="touchMove" @touchend="touchEnd"  -->
</template>

<script>
import WxCanvas from './wx-canvas';

export default {
  props: {
    canvasId: {
      type: String,
      default: 'ec-canvas'
    },
    lazyLoad: {
      type: Boolean,
      default: false
    },
    disableTouch: {
      type: Boolean,
      default: false
    },
    throttleTouch: {
      type: Boolean,
      default: false
    }
  },
  // #ifdef H5
  mounted () {
    if (!this.lazyLoad) this.init();
  },
  // #endif
  // #ifndef H5
  onReady () {
    if (!this.lazyLoad) this.init();
  },
  // #endif
  methods: {
    setChart (chart) {
      this.chart = chart
    },
    init () {
      const { canvasId } = this;
      this.ctx = wx.createCanvasContext(canvasId, this);

      this.canvas = new WxCanvas(this.ctx, canvasId);

      const query = wx.createSelectorQuery().in(this);
      query
        .select(`#${canvasId}`)
        .boundingClientRect(res => {
          if (!res) {
            setTimeout(() => this.init(), 50);
            return;
          }
          this.$emit('onInit', {
            width: res.width,
            height: res.height
          });
        })
        .exec();
    },
    canvasToTempFilePath (opt) {
      const { canvasId } = this;
      this.ctx.draw(true, () => {
        wx.canvasToTempFilePath({
          canvasId,
          ...opt
        });
      });
    },
    touchStart (e) {
      const { disableTouch, chart } = this;
      if (disableTouch || !chart || !e.mp.touches.length) return;
      const touch = e.mp.touches[0];
      chart._zr.handler.dispatch('mousedown', {
        zrX: touch.x,
        zrY: touch.y
      });
      chart._zr.handler.dispatch('mousemove', {
        zrX: touch.x,
        zrY: touch.y
      });
    },
    touchMove (e) {
      const { disableTouch, throttleTouch, chart, lastMoveTime } = this;
      if (disableTouch || !chart || !e.mp.touches.length) return;

      if (throttleTouch) {
        const currMoveTime = Date.now();
        if (currMoveTime - lastMoveTime < 240) return;
        this.lastMoveTime = currMoveTime;
      }

      const touch = e.mp.touches[0];
      chart._zr.handler.dispatch('mousemove', {
        zrX: touch.x,
        zrY: touch.y
      });
    },
    touchEnd (e) {
      const { disableTouch, chart } = this;
      if (disableTouch || !chart) return;
      const touch = e.mp.changedTouches ? e.mp.changedTouches[0] : {};
      chart._zr.handler.dispatch('mouseup', {
        zrX: touch.x,
        zrY: touch.y
      });
      chart._zr.handler.dispatch('click', {
        zrX: touch.x,
        zrY: touch.y
      });
    }
  }
};
</script>

<style scoped>
.ec-canvas {
  width: 100%;
  height: 100%;
  flex: 1;
}
</style>
